The following photo is a link to a YouTube video supplied by the Society of Manufacturing Engineers that it is titled Computer-Aided Design. It was not drawn it CATIA v-5 but it is a very good generic explanation of how parts are modeled in CAD systems.
Model.jpg

Keeping that information in mind look at the following video and see how the parts in the first video were designed.


I hope that video helped you get a general understanding of part design.
The next page will cover the CATIA v-5’s Computer Controlled Numerical Controlled Programming Features (CNC).


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